Shudder or vibration on deceleration 240sx s13 ?

[Black R]

I just recently started noticing a shudder or vibration on decel or when I lift off the throttle during Hwy cruising speeds 60-80. I have diagnosed that it isn't brake related, nor is it engine or tranny related.

I'm guessing it's possibly an axle or diff issue - or maybe driveshaft?

Anyone else had this problem and have suggestions on what to check first?

[V1A]

http://nissanroadracing.com/showthread.php?t=757&highlight=noise&page=2

[Black R]

I remember that thread.

However, the noise isn't my issue; it's the vibration which becomes quite severe and seems to come from the rear end. It reminds me of the vibration you experience when you run over those rumble strips in the emergency lane on the side of the Hwy.

[SoSideways]

Make sure all the nuts/bolts holding your axles on from the output flanges are all tight.

I remember back when mine had vibrated loose on both sides, it seemed like something was disconnected from the rear every time I would accelerate or decelerate, it was very odd.

[Def]

I remember that thread.

However, the noise isn't my issue; it's the vibration which becomes quite severe and seems to come from the rear end. It reminds me of the vibration you experience when you run over those rumble strips in the emergency lane on the side of the Hwy.

Is it most pronounced in 4th gear? If so, that's the noise we're talking about.

It's enough to easily feel it from the driver's seat, and it'll make your rear view mirror shake a lot. I guess hitting a rumble strip on the highway is about equal if you have solid bushings.

[V1A]

And there's a good possibility that it's even worse in your case since you have a 2JZ. The harmonics are probably way off with that swap.

[Black R]

Well it just started happening and I can figure out why.

It happens in 5th gear bc that's my cruising Hwy gear.

However, its independent of rpm and gear (happens even if I put the car in neutral and take my foot off the gas while coasting down from higher speeds.)

I was thinking it's axle(s) or u-joint on the driveshaft...

I'll post up when I find the culprit.

[Def]

Vibration related to speed is probably driveshaft if it's as violent as you say. I don't think the axles have enough inertia to really give a ton of vibration like that. Usually a bad axle will give some nasty behavior when power is put on it, but not just cruising (usually).

[Black R]

Fwiw, it ended up being the bolts at the driveshaft to diff flange... They were all loose and had lots of play..,

[Matt93SE]

Glad you found it!

..speaking of that. last time I swapped my diff at the track, I noticed I was missing two bolts on one axle flange. doh. anybody have some spares?

[Def]

Glad you found it!

..speaking of that. last time I swapped my diff at the track, I noticed I was missing two bolts on one axle flange. doh. anybody have some spares?

Some zipties will hold what your KA is making.

[Bubba]

Glad you found it!

..speaking of that. last time I swapped my diff at the track, I noticed I was missing two bolts on one axle flange. doh. anybody have some spares?

Let me look in my hardware box... I think I have what you're looking for.